From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9D08C4167B for ; Wed, 6 Dec 2023 19:16:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1442771AbjLFTQk convert rfc822-to-8bit (ORCPT ); Wed, 6 Dec 2023 14:16:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51298 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379257AbjLFTQh (ORCPT ); Wed, 6 Dec 2023 14:16:37 -0500 Received: from mail-oi1-f197.google.com (mail-oi1-f197.google.com [209.85.167.197]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 86867193 for ; Wed, 6 Dec 2023 11:16:43 -0800 (PST) Received: by mail-oi1-f197.google.com with SMTP id 5614622812f47-3b8b5221627so222292b6e.2 for ; Wed, 06 Dec 2023 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2002:a05:6808:180f:b0:3b9:dada:1dbb with SMTP id bh15-20020a056808180f00b003b9dada1dbbmr220863oib.10.1701890202917; Wed, 06 Dec 2023 11:16:42 -0800 (PST) Date: Wed, 06 Dec 2023 11:16:42 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000fde085060bdc30ec@google.com> Subject: Re: [syzbot] [fs?] general protection fault in pagemap_scan_hugetlb_entry From: syzbot To: sidhartha.kumar@oracle.com Cc: sidhartha.kumar@oracle.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > #syz test git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-hotfixes-unstable > ________________________________ > From: syzbot > Sent: Saturday, December 2, 2023 6:17 PM > To: akpm@linux-foundation.org ; dan.carpenter@linaro.org ; linux-fsdevel@vger.kernel.org ; linux-kernel@vger.kernel.org ; linux-mm@kvack.org ; llvm@lists.linux.dev ; Mike Kravetz ; muchun.song@linux.dev ; nathan@kernel.org ; ndesaulniers@google.com ; Sidhartha Kumar ; syzkaller-bugs@googlegroups.com ; trix@redhat.com > Subject: [syzbot] [fs?] general protection fault in pagemap_scan_hugetlb_entry > > Hello, > > syzbot found the following issue on: > > HEAD commit: df60cee26a2e Merge tag '6.7-rc3-smb3-server-fixes' of git:.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=17ad46fce80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=bb39fe85d254f638 > dashboard link: https://syzkaller.appspot.com/bug?extid=6e2ccedb96d1174e6a5f > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17befd62e80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10d5a90ce80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/c632017e0dc4/disk-df60cee2.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/f94c8fa25aeb/vmlinux-df60cee2.xz > kernel image: https://storage.googleapis.com/syzbot-assets/af80f80c708b/bzImage-df60cee2.xz > > The issue was bisected to: > > commit a08c7193e4f18dc8508f2d07d0de2c5b94cb39a3 > Author: Sidhartha Kumar > Date: Tue Sep 26 19:20:17 2023 +0000 > > mm/filemap: remove hugetlb special casing in filemap.c > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17f61552e80000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=140e1552e80000 > console output: https://syzkaller.appspot.com/x/log.txt?x=100e1552e80000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+6e2ccedb96d1174e6a5f@syzkaller.appspotmail.com > Fixes: a08c7193e4f1 ("mm/filemap: remove hugetlb special casing in filemap.c") > > general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 0 PID: 5072 Comm: syz-executor107 Not tainted 6.7.0-rc3-syzkaller-00014-gdf60cee26a2e #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 > RIP: 0010:pagemap_scan_backout_range fs/proc/task_mmu.c:1946 [inline] > RIP: 0010:pagemap_scan_hugetlb_entry+0x6ca/0x1130 fs/proc/task_mmu.c:2254 > Code: 3c 02 00 0f 85 68 09 00 00 48 8b 83 80 00 00 00 48 8d 04 40 4d 8d 6c c5 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 51 09 00 00 4d 8b 75 00 48 8b 7c 24 08 4c 89 f6 > RSP: 0018:ffffc90003a2fa50 EFLAGS: 00010246 > RAX: dffffc0000000000 RBX: ffffc90003a2fdb0 RCX: ffffffff82111e46 > RDX: 0000000000000000 RSI: ffffffff82111e54 RDI: ffffc90003a2fe30 > RBP: 1ffff92000745f52 R08: 0000000000000006 R09: 0000000020ffc000 > R10: 00000000211f9000 R11: ffffffff915f5de8 R12: ffff8880299e0300 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000020ffc000 > FS: 0000555555c7b380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000005fdeb8 CR3: 00000000752b4000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > walk_hugetlb_range mm/pagewalk.c:326 [inline] > __walk_page_range+0x36c/0x770 mm/pagewalk.c:393 > walk_page_range+0x626/0xa80 mm/pagewalk.c:521 > do_pagemap_scan+0x40d/0xcd0 fs/proc/task_mmu.c:2437 > do_pagemap_cmd+0x5e/0x80 fs/proc/task_mmu.c:2478 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:871 [inline] > __se_sys_ioctl fs/ioctl.c:857 [inline] > __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 > do_syscall_x64 arch/x86/entry/common.c:51 [inline] > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 > entry_SYSCALL_64_after_hwframe+0x63/0x6b > RIP: 0033:0x7f171819d669 > Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fffbe81bb68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007fffbe81bb80 RCX: 00007f171819d669 > RDX: 0000000020000040 RSI: 00000000c0606610 RDI: 0000000000000003 > RBP: 00007f1718210610 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000286 R11: 0000000000000246 R12: 0000000000000001 > R13: 00007fffbe81bdb8 R14: 0000000000000001 R15: 0000000000000001 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:pagemap_scan_backout_range fs/proc/task_mmu.c:1946 [inline] > RIP: 0010:pagemap_scan_hugetlb_entry+0x6ca/0x1130 fs/proc/task_mmu.c:2254 > Code: 3c 02 00 0f 85 68 09 00 00 48 8b 83 80 00 00 00 48 8d 04 40 4d 8d 6c c5 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 51 09 00 00 4d 8b 75 00 48 8b 7c 24 08 4c 89 f6 > RSP: 0018:ffffc90003a2fa50 EFLAGS: 00010246 > RAX: dffffc0000000000 RBX: ffffc90003a2fdb0 RCX: ffffffff82111e46 > RDX: 0000000000000000 RSI: ffffffff82111e54 RDI: ffffc90003a2fe30 > RBP: 1ffff92000745f52 R08: 0000000000000006 R09: 0000000020ffc000 > R10: 00000000211f9000 R11: ffffffff915f5de8 R12: ffff8880299e0300 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000020ffc000 > FS: 0000555555c7b380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000005fdeb8 CR3: 00000000752b4000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: 3c 02 cmp $0x2,%al > 2: 00 0f add %cl,(%rdi) > 4: 85 68 09 test %ebp,0x9(%rax) > 7: 00 00 add %al,(%rax) > 9: 48 8b 83 80 00 00 00 mov 0x80(%rbx),%rax > 10: 48 8d 04 40 lea (%rax,%rax,2),%rax > 14: 4d 8d 6c c5 00 lea 0x0(%r13,%rax,8),%r13 > 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 20: fc ff df > 23: 4c 89 ea mov %r13,%rdx > 26: 48 c1 ea 03 shr $0x3,%rdx > * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 2e: 0f 85 51 09 00 00 jne 0x985 > 34: 4d 8b 75 00 mov 0x0(%r13),%r14 > 38: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi > 3d: 4c 89 f6 mov %r14,%rsi > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup Command #1: "mm-hotfixes-unstable" does not look like a valid git branch or commit.